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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d3803b9b683aa03e642d8bbbe17dd2321c0c2c645fee6e1543e473e2bd0c15' 
  AND token = 'crr6sEzZCCzB19QfhxKkPPadEDJtyP4djoO1J9u2ik0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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