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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a008125b93321312d1afa70d73a7a0e21b26d74b31f7210a23f5d1a043cfc9a' 
  AND token = 'rCemAxgza/ykGhFXzoM+xcPdaYejxbGBdspCCDBgZcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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