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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc7db2e90b5075e8b835347c510850955e7311d4ce9435c2857f9aee6029b1a' 
  AND token = 'AcUD8ny6fyTGlw9LNAPT4e9b9eJz+YUlhtItyqDFFiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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