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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f679af98286a2ed3ab12a0512df267a7ee666a863b02b4c9eec070b053ca48d1' 
  AND token = 'Ftux0kOCY7/WtxhKzxxHpGjepG7kJ905Akl1oNL3O50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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