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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341cc8e5d46cc46cc010c407243d62fb9eddb4d5a5cabad07042bba25fefb4f2' 
  AND token = '+jIK4Z0nCCJX4YX9sE/ruANosIfYTm8SSBB2sQVB21g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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