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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac586ff9c2c3495a9fa68b5b8faf357b2810509d26c5074f9b5c6358719c5dd' 
  AND token = 'N3UN6LmlCrEmhYzKyN0stxDPjI23hKSYq1CBA6SHXY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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