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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c48b1d75d1d0115c0584ca2f4f6399626c1b5d1a6ad21bf4836698c36a09b94' 
  AND token = 't/PY1zLFGgL16sqcudEUjItMiZGPCd4/fbyuinK7ISk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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