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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175c7beb25c8eeb99d4b76f88659e7bd051ab521300a38d99de14f612d92268c' 
  AND token = 'fJ3/+j4urCDop7JnLdRK4GH85O4Wsbxywu07l45kcfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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