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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a9ad2fcf40713cca9a52cbed04a3fa3f9730a608261012fdfbda6cb481916a' 
  AND token = 'l/FscYZs/Gkfrb2MgSHeaXkqeCmm4vroad9sJ9VQhbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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