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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e82fc62e3fecfaffdd37360fd9def4b7fbac81fa6e0e2069158ff7170113c7' 
  AND token = 'gKNS4fJy+adVFSl4YU5SoJ9Is0lQbbuENsB6AwR2/7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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