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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43e131d4d6b124a52a9cd86ec101d2b38ebdfc60b495580ae05ab991c586ca1' 
  AND token = 'UbN/zj0l6f/eKBciStiQnJ31vfGX6CisvBx9fxwfGhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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