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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa666e75be5ba674b122fbc6cb57062ec2756edfc8aa7759eb2f5bb46b78720' 
  AND token = '0Hy7PKj35LIKgrq4TrjTw45D+DibXkvVB3nNOHYwc34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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