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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bd3c91ce1199e6fae1ea29b62ba7012c62ad12758b33d5ae5f05b2198838bb' 
  AND token = 'dDE9ID7Knxmz3gBCWOT4vVIXFqA6lhI5jtfFidkfZNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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