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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32423dca45d43b349e9121423d0f7b51d65e36fd23f180e341e2c8988143ab7' 
  AND token = 'vF6U0gPjGxnx4cQM1uXns6AA1nMbgrur3/Z46kHYdXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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