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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13a965bbc68ad82db983e519e700855f90acfc8a5934c57f0f3a459590e8770' 
  AND token = '8A1EEuV5a1OxFK/5+3i/vPhY29dfqCq9D+KqvCXPrw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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