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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6467185d1c789ead60e2768e92071db1aeda049210d056ee63358c49cbdbeb' 
  AND token = 'JrOB4EWA6VCReWxhW07ywgA6b/UHNNSeiOMcEQO74Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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