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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fda8a3499c77d02372e4603d180e192c07fcd760ec1e7b5fd9bb2b11e43dbec' 
  AND token = 'HgjUGZWIl2KjL3QFLUDGwnszdu7ukcp9vr6dVdDWYKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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