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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2994e34e842c0914e9709e0a6ce39137122d77c78fb209bfc19ebb64c10638' 
  AND token = 'n6zLRvpUOhYjYLASvS4tRLif6svfwYj2QnklKXudp0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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