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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1407803fd096a3390013c377862dd9dd0dafd94fd000e47c1df59f54485e60' 
  AND token = '9KbsEF9JhXH3L1WHRarVRXKJBq19QZ4AZhO01w5gJA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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