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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbd463255f094e67ce06971c2c64b0854c460cda9acaf1da25185206be4ab82' 
  AND token = '4S2BVD77vMEsMTKA6d1E5hB4GJJ+RV1TMGYlmfktOBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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