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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d12c8571d838d578a1010df9cad8d2093bc0db003537b8f76b6c655f3d461d8' 
  AND token = '3/PI+nR3p8ir3sGQ77AyomJC1EPKKM/1BZeeGKR9rEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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