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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d6e489c1f8d8aa09ea6e686f3b884381c1a13591d8f8cd691db9ed3c0db6a9' 
  AND token = 'FftEEE/s4YRKd48G6EFC/q06kz1zAInAaFosQnk1CQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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