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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ce94bd94bdce4b0fe110d5c059457cc00fb21dceb4cf08b90b390d4c6256d1' 
  AND token = '9PZF40dXSCTRNd8FP9g61dZWFl3/ef8nnfVPcSeMu/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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