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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6babc9cb411d3fc326a9ca77fc1fbfe64a34f56b2008384243ba2fdf2b937311' 
  AND token = 'I+QD6m520weK/THS5guxFs11fQSUYRzyuLBNBw1U9tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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