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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defe1bfe648daf5a93bbce62a8c7d867dd90a1bb254eeb2a5c94c0c25c356d2a' 
  AND token = 'YcnlUDNoUpF5rBhiRWUQWZHS30QY472k1Et52vIPl+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}