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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88616c8ebdf0b5756c44c8c4062bf7e496e50324807f01c0680dd4ab8613bfc' 
  AND token = 'N3WfS5+Zxi1mTugQzewN2ZomJmxizpBLvmI0dgiD1yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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