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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b836bda481a00f32abd6a371917b2bb3ec9f8413f08b325dd92d78048a87bf' 
  AND token = 'iNQ0Cm8n7+Iot/nldNwfmJ7R1tPO7Soi/yhcwkr8MNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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