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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd751221cf750fed1a78f6ea283279680bbc0d383fa05ad11b75d5f883760e6f6' 
  AND token = 'jhLHA2DjI3Ljjweyd83cGJa9EMkahIKkyH+P5WXkBXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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