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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc20af3c01644f2f3afa9dfd9d75c106b43c7a0230e018fc3bee09472e1f577' 
  AND token = 'IVHv+rITODme2RBjOVR3juod8U4urmiveIMTUkXpMBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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