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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70dadefb61f985db31603b51d56cead60ed6d721b79dbd642b161a57c865773' 
  AND token = 'k0Pl31DBfnnn/9yUCYPW36KilBW4MoVpuWLtvudzaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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