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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469a03eaf8c77eaa0f3ad15742c8c1ee969d9ca4e5a50dd3ed872b7a5ed4f29e' 
  AND token = 'EX4XRFfrQILNcMuDzK8SxykhDtoEZ1vOkxZRfiq7PFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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