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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad6e226e1860afe5bbbe9f3019cde32dfefa5e4abd3041d8a37ecae54028c52' 
  AND token = 'kUHSIkxdsJCyeELRFDfEie82ZVOh4RX3J1SbaItQYSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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