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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183756740ec4c4dc27e4ead7ab966f3ca43f0472c8d8bc144012bc96c43d7d4b' 
  AND token = 'J0H0q+GkbLUNWYTkxhTXR64Eq5D+pgE867aquSFCLtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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