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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c7035601926dfa758a4b6b673328d62366ab2f5f8278085245597b6d3967bc' 
  AND token = 'oo3Uwv+ouHRCELaIe7KIl1jdY4Ae3RGbdppQz0PVuNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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