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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988193e3ff4c7450336c346d1989cbc976575c3c9c82e9108b0519126b508c7b' 
  AND token = 'AN8IcE84Be9AU4S2icuVizKveek2SkCQKnW6xyqMyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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