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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553c0d718dc39e4da4cbf307bc45c465f4beacdccfe03fecf2bad508b60d1709' 
  AND token = 'RjzqGjmsLRtzBQgJay8zPFupS5oTSjjfvMI2l80Uu88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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