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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a77fa132f039167d01b00dbd1b7b9e1cd51ef4300ef85e753915265417fd9ce' 
  AND token = 'U0GMKh05eGCsrmganoHe7RmuWgRO3tDPZ26mYRsnIuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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