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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06cabd4df398858c2ffb23cc963e6ea15c5c680f1446edd43cf96ae049bef39' 
  AND token = '6Zj44zpPMOmtDHfjbFbCbRXhAR4d3Ad8hSl9Y0TCToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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