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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff07f895dbea97f737d4326d68d2ebec2a243a8972bb8363172930b2a9b30805' 
  AND token = 'L5zHLfTkevU7NUeG2aXgoGXf0Fa5eT1W1g4EilUlT+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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