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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4a07f367dc2f58e6a7dcc8550e9c9f602f1c5def43e30b3b4c26e8c42820e2' 
  AND token = 'WxrV3v/KLOtcLyJvios6eeaLJp4AGX7mOmvvqc8hrq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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