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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfdc70565e982d8c4ef1e547f7886c9cec0ec31dd1eb8965838c7dc9123b7a6' 
  AND token = 'lK4KXLg5jUkh+ACv3LVo8Zs3kDmxJ8c6LssFSxDdjjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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