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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1892a5b2747e237f6e16dabe78747590448da791416e16b294cbe2a501e8b4a' 
  AND token = 'kNT7jSw1d94UnpTV4GV50T7bxbVceBECIvQdPa5dGnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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