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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e66b10b30bade77aadca339c3f7559356a81c0b46373935fd74b6a9150985e' 
  AND token = 'nEq95vlfl4XARjlknN1TF5mKaGCX9wl2VZlvN2uGlNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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