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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0055fe163befdd9ff29acfd5476b5f8d7fd8b0c6c7b7896d516217528a8884f2' 
  AND token = 'aKFopQa3KM248XufmDUu4/HyTDOKbC4B20Gtui21IV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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