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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7023364b1ef794f7cbd2c23a09e4ad40f8b093470ee10e35c8b0da5c4c4bda3d' 
  AND token = 'ql6ALDS7Lc76m5Hky4otiJfv9NCouEwYQz5Bbj9XPsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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