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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be80f4261580676a8c1c08edc0ae9d223c9f23a7b403fd39f02c55c73dbdf920' 
  AND token = '9uLKv2BGwME4q+3Bw22cTAGNTA0d6MXmur153WTNdbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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