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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90f4c11ecfb647afe74556bbabe0be4252a2f2a4f52262d7534ac8f49f75302' 
  AND token = 'dKHHPvT8CjXPek/wYYoiyJaApDSIRkDamxoZviuiPEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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