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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd979540c73e657c37af4ddee7eb567c59caa548435643a0462331bd05b21e13' 
  AND token = 'y+4OufHj1P97JI7IC+isaNUV3z75z3z6CKAtHFgS8U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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