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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295e773fc6c88e06ea8c8d4ce416ede4c99c02c58ce2fd604080505c94a6f2bd' 
  AND token = 'isH3DR5x6Uv4CdOOW55idAhF0nVai2WnJZfQGK3vvPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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