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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b4e87d200314eb14db581ce4b7728402fbad95d4283f0b7c59c1e34b8cb2bb' 
  AND token = '02tDH4WbNNo/DlDZ+1xeE8/sRsmV8cEGF+UJAND80UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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