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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92b92860b07eaba90f42045a8f4ba739a357998266e7e0f789558b3aee45025' 
  AND token = 'otHcgGdNIlCwcVGBPGKZAom6t2HMevRwjlfhTDQu1R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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