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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b389134a5d1470726d98523e017f97f84996a5b799b7ed5e12473f81dc519254' 
  AND token = 'w41vTe2I5Ghm0rLXUO/UONa8OIvCu9CO0fhikGvXFFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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