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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6da72623eecd6ec06138be0d331a40497c721f0d3e145e2d5b28eaadc8a99d' 
  AND token = '+tZR7T8SDDiNJ8lAL8JMHpb4AuzTK9dYvleSTK4op2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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